How to remove some elements from a matrix?
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Jarvis Huang
on 23 Apr 2015
Commented: Jarvis Huang
on 23 Apr 2015
Hi everyone
Now I have a matrix which has two columns and several rows.
How can I remove the rows which contains value that read 0 and create a new matrix?
Any help would be really appreciated!
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Accepted Answer
Star Strider
on 23 Apr 2015
The find function with two outputs is helpful here:
M = randi([0 10], 20, 2); % Create Data
[r,~] = find(M == 0); % Rows With ‘0’
M(r,:) = []; % Delete Rows With ‘0’
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More Answers (1)
Stephen23
on 23 Apr 2015
Edited: Stephen23
on 23 Apr 2015
We can do this simply using all and logical indexing, which is faster than using find and also allows us to allocate directly to a new matrix:
>> M = randi([0,5], 8, 2)
M =
2 4
5 4
4 4
5 2
3 3
0 1
5 4
5 0
>> N = M(all(M~=0,2),:)
N =
2 4
5 4
4 4
5 2
3 3
5 4
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